diff options
Diffstat (limited to 'examples/shape.cpp')
| -rw-r--r-- | examples/shape.cpp | 244 |
1 files changed, 122 insertions, 122 deletions
diff --git a/examples/shape.cpp b/examples/shape.cpp index b451b5ba..ea1f53d2 100644 --- a/examples/shape.cpp +++ b/examples/shape.cpp @@ -1,122 +1,122 @@ -// Demo of polymorphism in C++
-
-#include <iostream>
-#include <memory>
-#include <vector>
-
-// Shape definition
-// ============================================================
-
-struct Point {
- float x, y;
-};
-
-std::ostream& operator<<(std::ostream& os, const Point& p) {
- os << " (" << p.x << "," << p.y << ")";
- return os;
-}
-
-struct Shape {
- virtual ~Shape();
- virtual void draw() const = 0;
-
- uint32_t color;
- uint16_t style;
- uint8_t thickness;
- uint8_t hardness;
-};
-
-Shape::~Shape()
-{
- std::cout << "base destructed" << std::endl;
-}
-
-// Triangle implementation
-// ============================================================
-
-struct Triangle : public Shape
-{
- Triangle(Point a, Point b, Point c);
- void draw() const override;
-
- private: Point p[3];
-};
-
-
-Triangle::Triangle(Point a, Point b, Point c)
- : p{a, b, c} {}
-
-void Triangle::draw() const
-{
- std::cout << "Triangle :"
- << p[0] << p[1] << p[2]
- << std::endl;
-}
-
-
-// Polygon implementation
-// ============================================================
-
-
-struct Polygon : public Shape
-{
- ~Polygon();
- void draw() const override;
- void addPoint(const Point& p);
-
- private: std::vector<Point> points;
-};
-
-
-void Polygon::addPoint(const Point& p)
-{
- points.push_back(p);
-}
-
-Polygon::~Polygon()
-{
- std::cout << "poly destructed" << std::endl;
-}
-
-void Polygon::draw() const
-{
- std::cout << "Polygon :";
- for (auto& p : points)
- std::cout << p ;
- std::cout << std::endl;
-}
-
-
-// Test
-// ============================================================
-
-void testShape(const Shape* shape)
-{
- shape->draw();
-}
-
-#include <array>
-
-int main(void)
-{
- std::vector<std::unique_ptr<Shape>> shapes;
-
- auto tri1 = std::make_unique<Triangle>(Point{5, 7}, Point{12, 7}, Point{12, 20});
- auto pol1 = std::make_unique<Polygon>();
- auto pol2 = std::make_unique<Polygon>();
-
- for (auto& p: std::array<Point, 4>
- {{{50, 72}, {123, 73}, {127, 201}, {828, 333}}})
- pol1->addPoint(p);
-
- for (auto& p: std::array<Point, 5>
- {{{5, 7}, {12, 7}, {12, 20}, {82, 33}, {17, 56}}})
- pol2->addPoint(p);
-
- shapes.push_back(std::move(tri1));
- shapes.push_back(std::move(pol1));
- shapes.push_back(std::move(pol2));
-
- for (auto& shape: shapes)
- testShape(shape.get());
-}
+// Demo of polymorphism in C++ + +#include <iostream> +#include <memory> +#include <vector> + +// Shape definition +// ============================================================ + +struct Point { + float x, y; +}; + +std::ostream& operator<<(std::ostream& os, const Point& p) { + os << " (" << p.x << "," << p.y << ")"; + return os; +} + +struct Shape { + virtual ~Shape(); + virtual void draw() const = 0; + + uint32_t color; + uint16_t style; + uint8_t thickness; + uint8_t hardness; +}; + +Shape::~Shape() +{ + std::cout << "base destructed" << std::endl; +} + +// Triangle implementation +// ============================================================ + +struct Triangle : public Shape +{ + Triangle(Point a, Point b, Point c); + void draw() const override; + + private: Point p[3]; +}; + + +Triangle::Triangle(Point a, Point b, Point c) + : p{a, b, c} {} + +void Triangle::draw() const +{ + std::cout << "Triangle :" + << p[0] << p[1] << p[2] + << std::endl; +} + + +// Polygon implementation +// ============================================================ + + +struct Polygon : public Shape +{ + ~Polygon(); + void draw() const override; + void addPoint(const Point& p); + + private: std::vector<Point> points; +}; + + +void Polygon::addPoint(const Point& p) +{ + points.push_back(p); +} + +Polygon::~Polygon() +{ + std::cout << "poly destructed" << std::endl; +} + +void Polygon::draw() const +{ + std::cout << "Polygon :"; + for (auto& p : points) + std::cout << p ; + std::cout << std::endl; +} + + +// Test +// ============================================================ + +void testShape(const Shape* shape) +{ + shape->draw(); +} + +#include <array> + +int main(void) +{ + std::vector<std::unique_ptr<Shape>> shapes; + + auto tri1 = std::make_unique<Triangle>(Point{5, 7}, Point{12, 7}, Point{12, 20}); + auto pol1 = std::make_unique<Polygon>(); + auto pol2 = std::make_unique<Polygon>(); + + for (auto& p: std::array<Point, 4> + {{{50, 72}, {123, 73}, {127, 201}, {828, 333}}}) + pol1->addPoint(p); + + for (auto& p: std::array<Point, 5> + {{{5, 7}, {12, 7}, {12, 20}, {82, 33}, {17, 56}}}) + pol2->addPoint(p); + + shapes.push_back(std::move(tri1)); + shapes.push_back(std::move(pol1)); + shapes.push_back(std::move(pol2)); + + for (auto& shape: shapes) + testShape(shape.get()); +} |